EP0484806A2 - Système de transmission et/ou de réception de données pour ordinateur personnel - Google Patents

Système de transmission et/ou de réception de données pour ordinateur personnel Download PDF

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Publication number
EP0484806A2
EP0484806A2 EP91118466A EP91118466A EP0484806A2 EP 0484806 A2 EP0484806 A2 EP 0484806A2 EP 91118466 A EP91118466 A EP 91118466A EP 91118466 A EP91118466 A EP 91118466A EP 0484806 A2 EP0484806 A2 EP 0484806A2
Authority
EP
European Patent Office
Prior art keywords
data
transmission
file
files
fact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91118466A
Other languages
German (de)
English (en)
Other versions
EP0484806B1 (fr
EP0484806A3 (en
Inventor
Paolo Ing. D'amato
Maurizio Dr. Poletto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SELECO SpA
Rai Radiotelevisione Italiana SpA
Original Assignee
SELECO SpA
Rai Radiotelevisione Italiana SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SELECO SpA, Rai Radiotelevisione Italiana SpA filed Critical SELECO SpA
Priority to EP95119978A priority Critical patent/EP0715462A1/fr
Publication of EP0484806A2 publication Critical patent/EP0484806A2/fr
Publication of EP0484806A3 publication Critical patent/EP0484806A3/en
Application granted granted Critical
Publication of EP0484806B1 publication Critical patent/EP0484806B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
    • H04N7/0882—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital for the transmission of character code signals, e.g. for teletext

Definitions

  • the present invention relates to a transmission and/or reception system of data for personal computers, by means of circular diffusion of radioelectric signals, carried out in teletext settings, in which the data is gathered in files and groups and transmitted according to a telesoftware transmission procedure, comprising a configuration page.
  • 'file' we mean a data block, for example constituting a computer program, or used as input from a computer program, or representing a written text or illustration.
  • the principle aim of the present invention is to indicate an improved data transmission system for personal computers of the type described, that facilitates the selection of the files desired by the user.
  • the present invention has as its object a transmission and/or reception system of data for personal computers, by means of circular diffusion of radioelectric signals, carried out in teletext settings, in which the data is gathered in files and groups and transmitted according to a telesoftware transmission procedure, comprising a configuration page;
  • the characterising principle of the invention consists in the fact that the files are divided into groups and that said configuration page contains information that allows the receiving terminal to construct a general index or master directory after having automatically acquired said configuration page.
  • a second important characteristic of the invention consists in the fact that the headings of the files of each group are concentrated in the first page of the group itself so as that when the user selects a group, the terminal automatically acquires such page and displays on the screen the group directory.
  • system provides for the data transmitted to be organised according to a structure of two levels, groups and files; a master directory is also provided for along with a group directory.
  • the system according to the invention also provides for the possibility of defining selective links between the files, so as to facilitate the selection and acquisition of data.
  • the present invention has a further aim of taking full advantage of the channel in use.
  • the present invention also has as its object a transmission and/or reception system of data for personal computers, by means of circular diffusion of radioelectric signals, carried out in teletext settings, in which the data is gathered in files that are transmitted according to telesoftware transmission system, characterised by the fact that the possibility of defining a compacting system of the data contained in the files is provided for.
  • the protocol of data transmission maintains the same transmission unit (line) and the same structure with regards the pages of the teletext system, used by the Televideo service by the RAI (Radiotelevisione nacha).
  • the line 0 is not utilized by telesoftware; all of the information is present from line 1 through to line 23.
  • the difference between Televideo and telesoftware lies in the type of information inserted in each single page:
  • the protocol according to the invention does not provide for a corrisponding biunivocal file-folder, therefore it is possibile to transmit more short files in the same folder, or divide a long file into several folders.
  • This latter possibility is of interest in that the actual integrated teletext decoding circuits allow for the simultaneous search and acquisition of four folders; in taking advantage of this possibility it is possible to reduce to a quarter the time needed necessary for the reception of a file.
  • the protocol according to the invention provides for two levels of protection of data with regards reception errors.
  • a CRC cyclic redundance check
  • a CRC cyclic redundance check
  • the protective strategy based on the line CRC has shown itself to be sufficient regarding practical objectives; however the protocol also provides for the possibility of a higher level of protection, so as to assure a good reception even in critical conditions (the probability of 99% of good reception in the first acquisition with error odds being 10-4); for achieving such results the Hamming codes are used along with the line CRC.
  • each telesoftware line of 40 bytes is divided into 8 code blocks of 5 bytes each; each code block is made up of 4 useful bytes, by 6 bits of Hamming redundance and by 2 CRC bits; even the CRC bits result in being protected by the Hamming code, that is a shortened code (40, 34).
  • the new protocol provides for the transmission of information which allows the receiving terminal to automatically produce directories;
  • the index system is of two levels: the files are divided into groups, each of which has its index (group directory); at the higher level the master directory is found.
  • the files contained in a determined group must have similar characteristics, i.e. they must be of the same type (binary or ASCII), for the same operating system and with the same level of protection (only CRC or Hamming + CRC).
  • the information relative to the master index is contained in the so called configuration page, that is transmitted every cycle; according to the number of groups, the configuration page may be a static one, or a folder of two or more subpages.
  • the telesoftware terminals upon turning on, automatically acquire the page or folder of configuration and, based on the relative information contained, produce the master directory on the screen.
  • the user must select the group of interest, for example moving the cursor to the relative section of the main index.
  • Each group occupies several consecutive folders; the first page of every group can be, according to neccesity, a static one, or a folder, containg all the headings of the files that make up the group.
  • the terminal When the user has selectioned a group, the terminal automatically acquires the first page of the group and generates, based on the relative information contained within, the group index. At this point the user can select the file or files that are of interest, for example by moving the cursor along the index and giving the relative acquirement command.
  • All the telesoftware pages (configuration page, group index page, or normal pages containing data) begin with the page heading, immediately followed by the useful data block.
  • This page contains, apart from the information relative to the main index, other important service information.
  • a software is realised that manages the reception based on the protocol according to the invention.
  • This software may receive updating, be it for the addition of new functions or for the correction of errors found in the previous versions.
  • the most elegant method of introducing to the receiving terminals a new version of the software is to transmit it via telesoftware, inserting it into one of the groups in transmission; the configuration page contains information, based on which every receiving terminal must, upon turning on, automatically program the acquisition of an eventual version of software received relative to its operative system and more recent than that contained in itself.
  • the configuration page contains, apart from its heading, three types of information: group specifics, the specifics relative to the protocol exchange (an abbreviation which means the specifics relative to the change of the receiving software that implements the protocol), and the specifics of the decompacting software exchange; given the importance of the information contained, the configuration page is always transmitted with the higher level of protection (Hamming + CRC).
  • the heading contains:
  • the heading of the first page of the group is constituted as follows:
  • the name of the file is that with which the file itself will be saved, and also comprises the extension; the string begins with a byte indicating the number of characters utilized, for a maximum of 15 characters.
  • the byte relative to miscellany a bit that indicates whether the name of the file has been compacted or not, a bit that indicates whether the name of the file is to be viewed in a fixed manner or flashing, an autosave bit and an autorun bit; the other bits are reserved for future applications.
  • the password can be constituted by six spaces: this means that the file is receivable by everyone; on the contrary the filed is destined to users that know the password.
  • Link an important characteristic of the new protocol is the possibility of defining a packet of files that have to be received jointly. Only files of the same group can be joint together; in practice, the link byte is the identifying number of the file that constitutes the successive ring of the chain; the last file of the chain points towards the first. To receive the complete packet it is necessary to simply ask for the acquisition of any file of the chain; obviously the files that do not take part of a packet point to themselves.
  • the block index consists of a progressive numeration of the blocks from which the file is divided, even belonging to different folders, and this is an aid for the receiving software in the phase of reconstructing the files.
  • the rolling index and the block index coincide.
  • transmission close the utility of which is apparent when changes in the transmission are carried out during the day. If a file is cancelled or substituted with another, the terminals that were acquiring it may behave in an abnormal manner if the alteration is not appropriately pointed out; moreover, the user may have problems in understanding the reasons of the abnormality.
  • the flag of transmission close, contained in the configuration page is raised a determined time, let us say x minutes (typically quarter of an hour), before a change that involves the main index.
  • the flag contained in the first page of a determined group is raised x minutes before a change involving that determined group.
  • the receiving software can take advantage of these flags for installing in the indexes, subject to change, a notice that warns the user to pay attention; if the user, after having referred to an index containing the notice, decides to attempt, all the same, to acquire a file, is aware of the fact that the acquisition may not be carried through.
  • the flags contained in the subpages of the files allow for the evaluation of the validity of an acquisition; such flags have a different kind of management, that of the flip-flop kind, and therefore must have the same value in all the subpages of a determined file. If after a while, subpages with opposite flags are received, this means that the file being acquired has been substituted by a new one and therefore the acquisition is not valid.
  • a different strategy could also be used; for example, the total number of programs available via telesoftware could be distinguished on the basis of the contents heading transmitted only in certain hours of the day.
  • the Televideo pages, that describe the telesoftware service would supply all the information relative to the said contents heading; it would be possible, when desired, to add to the file heading the hour in which transmissions start and finish, something that would render useless the change signalling mechanism previously described. This and other modifications can be provided at any moment, taking advantage of the software's reception downloading mechanism previously described.
  • the enclosed figure represents a semplified block drawing of the system, constituted by a local area network (LAN) of personal computers, having the following functions:
  • the two PC servers A and B are indicared in the figure, furnished with a serial line RS 232 for the connection with the central computer that manages the teletext service.
  • One of the two "master” is usually working “master”, whilst the other constitutes the “slave” or back up, and shall be of the "lot” type, i.e. comprising a watch dog automatic commutation circuit for identifying breakdowns.
  • the work stations may be of a variable number, with regards to the activity caried out (two of which being indicated in the figure).
  • the work stations, user/manager, are utilised, as said, by computer programmers for the preparation and verifying of the files, and by the system manager for the definition of the total number of programs available; therefore it must be possible, from such work stations, to transmit files and transmission instructions towards the file server. It is considered to be of use the separation of the two functions "user” and “system manager” by means of appropriate passwords. Apart from the password it is also considered useful the introduction of user identification.
  • the work stations shall have many peripherals, so as to allow the computer programmers the acquisition of various data.
  • paticular it is considered to be of use a scanner for the acquisition of graphics, an optical reader for the acquisition of written text and an optical disc.
  • connection via the telephone network or ITAPAC, with external data banks (here a modem is necessary).
  • a reception device for verifying the files transmitted.
  • a device is indicated in the figure as the reception control, and is constituted of a computer supplied with telesoftware interface with video input in high and low frequency; it receives from the PC server of computer direction the information relative to the files in transmission; it comprises a software that automatically manages the reception of said files and sends them to the computers of the computer direction: these, in abnormal cases, for example a non perfect coincidence of a file in transmission with that memorised in the server, sends messages of advice, of errors, and of alarm to predisposed suitable devices.
  • a MAIN program is run on the computers of the computer direction, which coordinates the realisation of the total number of programs available, managing numerous automatic functions.
  • the manual functions can be however the following:
  • the receiving terminal can consist of a television set comprising a suitable data output serial port that permits the connection with a personal computer; or, preferably, the terminal can consist of a personal computer or a home computer, comprising a suitable circuit board allowing for the direct reception of the telesoftware.
  • Figure 2 represents a block drawing of a realisable example of said circuit board.
  • the letter A indicates a television receiving antenna; the television signals intercepted by this are passed to a tuner (T), of a conventional type, for example a synthesizer frequency tuner, that allows for the tuning of television channels from both the VHF range and the UHF range.
  • T tuner
  • the tuner also comprises an amplifying circuit of intermediate frequency and a video detector, according to recent television technology; the tuner supplies in output a base band video signal, relative to the tuned channel; such signal reaches the video input processor, that provides for, in a known way, the extraction of the teletext data associated to the received television program from the video signal.
  • Said teletext data reach the teletext decoder (DT), that decodes the signals received, composes the teletext pages according to commands received (see following), and is able to memorise up to four pages in the page memory (MP).
  • DT teletext decoder
  • MP page memory
  • the decoder comprises 4 reception banks, completely separated and independant; it is therefore possible to receive up to 4 teletext pages simultaneously, taking full advantage of the above described characteristics relative to the protocol according to the invention; the recption process is greatly improved so as to obtain the maximum reception speed.
  • the commands reaching the decoder DT from the principle microprocessor of the personal computer (PC), through an interface (IM), that provides for the conversion of logic signals coming from the parallel port of the personal computer to serial signals, that, through the internal serial bus of the circuit board (IB), control the tuner T and the decoder DT.
  • PC personal computer
  • IM interface
  • IB internal serial bus of the circuit board
  • the personal computer can manage the functioning of the circuit board's two components, and is able to analyse, by means of the decoder itself, the data contained in the memory MP.
  • the block designated CT represents a voltage convertor, that adapts the input voltage, available on the slot of the computer, to the needs of the tuner T.
  • the software of the personal computer must comprise an initial program, according to the protocol described above, to which the telesoftware will be implemented, so as to acquire, by means of the circuit board in figure 2, the telesoftware that manages the data received, of which, every terminal must, upon turning on, automatically program the acquisition, if the version in possession precedes the version in transmission; naturally the above is also valid for the eventual acquisition of new versions of decompacting software.
  • the computer will be able to visualise on the screen of the relative monitor the main index of the telesoftware transmitted, and, as soon as the user has selected the group of interest, for example moving the cursor to the section of the main index, the index group chosen, the user at this point can select the file or files that he considers interesting, for example moving the cursor along the index and giving the relative acquisition command, so as that the subpages contained in that file or files are transferred, from the memory MP of the circuit board, to the computer's main memory.
  • the reconstruction of the files, obtained composing the various blocks transmitted on the subpages, occurs inside the personal computer.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)
  • Information Transfer Between Computers (AREA)
  • Computer And Data Communications (AREA)
  • Communication Control (AREA)
  • Auxiliary Devices For Music (AREA)
  • Electroluminescent Light Sources (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
EP91118466A 1990-11-07 1991-10-30 Système de transmission et/ou de réception de données pour ordinateur personnel Expired - Lifetime EP0484806B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95119978A EP0715462A1 (fr) 1990-11-07 1991-10-30 Procédé de transmission et/ou de réception de données pour un ordinateur personnel

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6787390 1990-11-07
IT67873A IT1241311B (it) 1990-11-07 1990-11-07 Sistema di trasmissione e/o ricezione dati per calcolatori personali

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP95119978.5 Division-Into 1991-10-30

Publications (3)

Publication Number Publication Date
EP0484806A2 true EP0484806A2 (fr) 1992-05-13
EP0484806A3 EP0484806A3 (en) 1993-03-03
EP0484806B1 EP0484806B1 (fr) 1997-08-06

Family

ID=11305983

Family Applications (2)

Application Number Title Priority Date Filing Date
EP95119978A Ceased EP0715462A1 (fr) 1990-11-07 1991-10-30 Procédé de transmission et/ou de réception de données pour un ordinateur personnel
EP91118466A Expired - Lifetime EP0484806B1 (fr) 1990-11-07 1991-10-30 Système de transmission et/ou de réception de données pour ordinateur personnel

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP95119978A Ceased EP0715462A1 (fr) 1990-11-07 1991-10-30 Procédé de transmission et/ou de réception de données pour un ordinateur personnel

Country Status (5)

Country Link
EP (2) EP0715462A1 (fr)
AT (1) ATE156644T1 (fr)
DE (1) DE69127166T2 (fr)
ES (1) ES2113868T3 (fr)
IT (1) IT1241311B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0742668A2 (fr) * 1995-05-09 1996-11-13 Deutsche Thomson-Brandt Gmbh Méthode de reproduction de signaux de données dans des canaux d'émissions de télévision ou de radio
US5577735A (en) * 1991-05-28 1996-11-26 Tci Technology, Inc. Computer software delivery system
DE19616709A1 (de) * 1996-04-26 1997-10-30 Porsche Ag Informationssystem
DE19825719B4 (de) * 1997-06-10 2004-07-08 Lg Electronics Inc. Sendevorrichtung für Hypertext-Markup-Language Daten (HTML-Daten)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306208A2 (fr) * 1987-09-02 1989-03-08 Ing. C. Olivetti & C., S.p.A. Méthode et appareil pour la transmission et/ou la réception de programmes d'ordinateur et/ou données au moyen de télétexte

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0306208A2 (fr) * 1987-09-02 1989-03-08 Ing. C. Olivetti & C., S.p.A. Méthode et appareil pour la transmission et/ou la réception de programmes d'ordinateur et/ou données au moyen de télétexte

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5577735A (en) * 1991-05-28 1996-11-26 Tci Technology, Inc. Computer software delivery system
US5944608A (en) * 1991-05-28 1999-08-31 Tci Technology, Inc. Computer software delivery system
US6126546A (en) * 1991-05-28 2000-10-03 Tci Technology Management, Llc Computer software delivery system
US6402618B1 (en) 1991-05-28 2002-06-11 Time Warner Entertainment Co. Lp Computer software delivery system
EP0742668A2 (fr) * 1995-05-09 1996-11-13 Deutsche Thomson-Brandt Gmbh Méthode de reproduction de signaux de données dans des canaux d'émissions de télévision ou de radio
EP0742668A3 (fr) * 1995-05-09 1999-09-01 Deutsche Thomson-Brandt Gmbh Méthode de reproduction de signaux de données dans des canaux d'émissions de télévision ou de radio
DE19616709A1 (de) * 1996-04-26 1997-10-30 Porsche Ag Informationssystem
DE19825719B4 (de) * 1997-06-10 2004-07-08 Lg Electronics Inc. Sendevorrichtung für Hypertext-Markup-Language Daten (HTML-Daten)

Also Published As

Publication number Publication date
IT1241311B (it) 1994-01-10
IT9067873A0 (it) 1990-11-07
ES2113868T3 (es) 1998-05-16
EP0484806B1 (fr) 1997-08-06
ATE156644T1 (de) 1997-08-15
DE69127166D1 (de) 1997-09-11
EP0715462A1 (fr) 1996-06-05
IT9067873A1 (it) 1992-05-07
EP0484806A3 (en) 1993-03-03
DE69127166T2 (de) 1998-03-19

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